Arson-- 2:53am, 200 Blk Duncan St. Officers Dominguez and Carrasco were conducting traffic control on an unrelated incident when they were flagged down by a citizen regarding a fire. The officers responded to the scene and found a portable toilet on fire. The fire had spread to a nearby vehicle, which also caught fire. SFFD responded and extinguished the fire. The owner of the vehicle was notified. No one was injured during this incident.